We proposed a concept of a massive electron scheme to explain the non-standard properties of high-temperature superhydride superconductors. We showed that the effective mass of the electron-quasiparticles exponentially increases with applied pressure and agrees with experimental critical temperatures. Our investigation showed that the superhydrides are strongly interacting-conventional BCS superconductors at high pressure due to the large density of states. The estimated density of states and conductivity at the transition, in the presence of a magnetic field, are consistent with the experimental observations. We showed that the coherence length, the London penetration depth, and the Landau–Ginsburg parameter all have strong pressure dependence, hence the traditional categorization of type-I versus type-II superconductors is not applicable to superhydrides. Further, we showed that the conductivity at the superconducting transition in the presence of magnetic field is 3-5 orders of magnitude larger than that of other superconductors. Therefore, the superconducting transition width is very narrow, similar to type-I superconductors as seen in experiments. This larger conductivity is due to the strong pressure dependence on the coherence length. In addition to H\(_3\) S and C-S-H systems, the LaH\(_{10}\)  system also shows near room temperature superconductivity under pressure [1]}. Even though we have not compared LaH\(_{10}\)  data with our theory, we anticipate our theory is applicable to this system also.
